Hi Darkd,
I loaded this theather on a single player game, and I tested all the weapons with no accesories. I found two things that are annoying (At least for me) on some weapons.
This two things are: Too fast aim animation and viewmodel too far.

Here is the list:
Too fast AIM animation
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Karabiner 98K
SR-25Ecc
M4A1 SOPMOD
STEYR AUG
M1911 Series Pistol
M45 Series Pistol
MP-443 Grach - BUT it has its own sounds that matches with the stock guns master, and feels good on shooting
SIG Sauer P220
M500
Spectre
AS-VAL